/*
 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.sun.max.vm.value;

import java.io.*;

import com.sun.cri.ci.*;
import com.sun.max.lang.*;
import com.sun.max.vm.type.*;

/**
 */
public final class VoidValue extends Value<VoidValue> {

    private VoidValue() {
        super();
    }

    public static final VoidValue VOID = new VoidValue();

    @Override
    public Kind<VoidValue> kind() {
        return Kind.VOID;
    }

    @Override
    public int hashCode() {
        return -1;
    }

    @Override
    public boolean isZero() {
        return true;
    }

    @Override
    public boolean isAllOnes() {
        return false;
    }

    @Override
    public boolean equals(Object other) {
        return this == other;
    }

    @Override
    protected int compareSameKind(VoidValue other) {
        if (this == other) {
            return 0;
        }
        // There is only one canonical instance of this value type
        throw new IllegalArgumentException();
    }

    @Override
    public String toString() {
        return "void";
    }

    @Override
    public Object asBoxedJavaValue() {
        throw new IllegalArgumentException("no void value");
    }

    @Override
    public WordWidth signedEffectiveWidth() {
        return null;
    }

    @Override
    public WordWidth unsignedEffectiveWidth() {
        return null;
    }

    @Override
    public byte[] toBytes(DataModel dataModel) {
        return new byte[0];
    }

    @Override
    public void write(DataOutput stream) throws IOException {
    }

    @Override
    public CiConstant asCiConstant() {
        throw new IllegalArgumentException();
    }

}
